Maintenance and Service
Diesel engine
7.1.5.3 Change of coolant
Use only corrosion protection/antifreeze agents approved by Mercedes-Benz. The
coolant must be exchanged every three years. In any case, comply with the regionally
applicable regulations on environmentally compatible disposal of coolant.
(12) Drain valve for coolant at cooling water pipe
Before renewing the coolant, check the cooling and heating system for leaks and con-
dition.
The drain valve (12) is installed on the coolant pipe (see picture).
– Slowly open the filler cap (11) at the expansion tank (10) of engine cooling system,
relieve excess pressure, then take off the cap.
– Screw on drain hose on the drain valve.
– Drain coolant and catch coolant in a suitable vessel.
– Close the drain valve again.
– Fill in coolant in the prescribed combination up to the lower edge of the filling neck
on the expansion tank (10) and close the cover lid (11).
– Set the desired temperature for the air conditioning system to the maximum tem-
perature, so that the control valve for the heating system is opened.
– Switch on the hydraulic oil tank and the underfloor heating.
– Switch on the park heating.
– Start diesel engine and let it run for about 1 minute at differing rotational speeds.
– Check the coolant level and, in case of need, fill up coolant.
– Have replacement of coolant confirmed in service documentation.
Specified coolant types: corrosion/antifreeze -40°
MB standard 325.5 and 326.5
Filling volume: approx. 25-30 litres
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